Electric heater



April 21, 1925. 1,534,733

' M. H. PEREZ ELECTRIC HEATER Filed Oct. 8, 1923 2 Sh eets-Sheet 1 v HVVENTOR: EE 5 fiiameZfiggziez'Z afimez, a m ATTORNEY- April 21, 1925.

M. H. PEREZ ELECTRIC HEATER Filed Oct. 8, 1923 2 Sheets-Sheet 2 i Q INVVENTOR: %zmewmiria rez ATTORNEY.

Patented Apr. 21, 1925.

UNITED STATES MANUEL HUMBERTO PEREZ, OF SAN PEDRO SULA, HONDURAS.

ELECTRIC HEATER.

Application filed October 8, 1923. Serial No. 667,343.

To all whom it may concern:

Be it known that I, MANUEL HUMBEn'ro Piinnz, a citizen of the Republic of Honduras, residing at San Pedro Sula, in the Department of Cortez and Republic of Hon duras, have invented new and useful Improvements in Electric Heaters, of which the following is a specification.

This invention relates to electric heaters, and one object of my invention is to provide a simple, reliable and eflicient type of heater adapted for general uses in heating various materials and for fusing metals or other purposes, and which embodies a novel form and construction of heating chamber or retort and electrical heating means for heat ing the same.

Another object of the invention is to provide an electric heater which may be employed for heating elements to be joined by soldering, brazing, welding and other similar methods. I

The invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a vertical longitudinal section through an electric heater embodying my invention, the core appearing in elevation.

Figure 2 is a horizontal transverse section on line 22 of Figure 1.

Figure 3 is a central vertical longitudinal section through the complete device.

Figure 1 is a vertical transverse section on line 4- iof Figure 3.

Figure 5 is a vertical transverse section on line 5-5 of Figure 3.

In carrying my invention into practice, as herein disclosed, I provide an electric heater comprising a suitable supporting base 1, made of porcelain or other insulating material, and upon which is disposeda'cylin drical casing or jacket 2 containing a cylindrical core 8, both thecasing and the core being also made of porcelain or other suitable material which is a non-conductor of heat.

The casing 2 is provided upon its interior with a continuous spiral thread 4, and the core 3 is provided with an external spiral thread 5 to engage the threads 4, whereby the core when inserted is positively held and secured within the casing against shifting movement of any character, and yet is capable of removal when occasion requires. The casing is normally open at both ends, as shown, and adapted to be closed at one end by a cap or cover member 6 having exterior screw threaded engagement therewith and provided with a projection 7 extending into such end of the cylinder. This projection 7 is of somewhat less diameter than the internal diameter of the adjacent end of the cylinder and is provided with a concaved inner surface 8.

The core 3 provides a heating chamber or retort which is open at one end 9 and closed at its opposite end by a hemispherical wall 10, beyond which a portion of the core projects in the form of an annular flange 11. The concaved face 8 of the projection 7 of the cap 6 bears against the hemispherical wall 10, and forms a positive abutment against which the closed end of the core bears, and the flange 11 of the core surrounds said projection 7 and is clamped thereby against the wall of the casing thus giving additional security against movement or displacement of the core within the casing. Embedded in the circumference of the core is a resistance unit 12, which is in the form of a spiral band or wire, the surfaces of the convolutions of which are exposed in the grooves or spaces between the threads 5 and, when the core is fitted in position, lie in abutting contact with the threads at. A conducting ring or metal band 13 surrounds the open end of the core and carries a binding post 1 1, to which one end of the resis 'ance unit 12 is fastened, the wire thence extending continuously around the surface of the core body and the flange 11 and being attached at its opposite end to a binding post on a contact terminal 15, the conductors 13 and 15 forming terminals at the opposite ends of the resistance unit for proper connection with current supplying means. By the described mode of mounting the core in the casing, and mounting the resistance unit on the core, a close fit between the elements just described is secured in order to obviate any liability of moisture or other foreign particles entering the surfaces and causing liability of short circuiting of the resistance coil. The casing 2 is provided at one end with a threaded opening 16, and the casing and its cap are provided at the opposite end with registering threaded openings 17, which openings 16 and 17 respectively receive the threaded ends f llt) plugs 18 and 19, having split spring lower end portlons adapted for engagement with V conducting bushings 20 and 21 forming sage'24 intersecting longitudinal bores'25 in which are disposed metallic connecting terminals 26 and 27which are in electrical contact with the bushings and21. A supply cable 28 leading from any suitable source ofelectric currentsupply,enters the passage 2 1 and is provided-with branches 29 and 30 forming the supply return conductors which are electrically connected respectively with the terminals 26 and27, through which terminals, the plugs 18 and 19 and the conductors 13 and 15,-current may be suppliedto the resistance unit in an obvious manner. Any suitable type of control switch may, in

practice, beemployed to let on and cut off the flow of electric current and govern the supply of the same to the resistance unit.

When current is supplied to the resistance unitthe core will beheated, with the result that the heating chamber thereof will be heated to a desiredtemperature, governed by the amount ofcurrent supplied to the coil. 1 In this chamber metals or materials may be pla-ced'to be heated, fused or melted, and, if desired, a temporary closure for the open end of the chamber maybe employed wheneverrequired during a heating operation.

I also provide means whereby the heater may be used for heating metals to be joined by soldering, brazing, welding, etc.,making the device of value to watchmakers, jewelers, electricians, and others having much work of thiskind to do. For the purpose described, I provide the casing 2' with a. conducting. surface 31 which is in electrical engagement with the conductor band or ring 13and provides an anvil or support against which one element of two metals 'to be joined may be placed. The other metal to be joined to the metal part resting on this support 31 may be gripped between the'jaws of a-holding tool, such as a pair of pinchers '32 electrically connectedrwith a conductor 33 coupled to a plugffia havinga contact terminal 35 adapted to'be fitted in any one of a series of openings 36 in the casing 2 and provided with a handle 37 of insulating material. The openings '36, of which anv tion, I claim number may be used along the length of the resistance unit,-and which'register with convolutions of predetermined heating flues at different distances along the resistance unit,

so thatwhen the contact 35 is fitted in a certain opening 36, it will electrically engage selected convolutions of the resistance coil. Current will then pass from conductor 29, plug 18, and band 13 to the surface 31 and the article resting thereon, and from conductor 30, plug 19, contact .17 and the portionofthe resistance unit between said contact 15 and the plug 34 and through the oon.-,

ductor 33 to the holding tool 32 and the metallic part held thereby. The circuit will then be completed for the production of a heating are by bringing the'two portions :of. metal 1nt0,proX1m1ty,-for more or less inti mate contact, thereby softening 1 or reducing a and metling them to 2 any desired degree for union by soldering, brazing, welding orother similar methods,inakingit-l1e device of great valueto mechanics, artisans. and others having work of this kind to'do.

From the foregoing descriptiointaken in connection with the drawings, the construction, modeofoperation and use of my improved electric heater will be readily understood, and it will be seen that it provides a device of this character which is not only simple in construction and embodies all the stated advantages, but which supplies anartiole of convenienttype fort-he use of those having need for a simple, inexpensive portable type of heater of thischaracter adapted for general uses. VVhilethe CO1]: struct1ondisclosedispreferred, it is to be understood that various changes in the form, proportions. and details of construe-i tion of the device may be resorted to, within the scope of the appended claims, without departing from the spirit or sacrificing any ofthe advantages of the invention. 7

' Having thus fully described my inven- 1, An electric heater comprising a cas- 1ng,-a core tlueaded into. the casing and forming a heating chamber, a resistance unit wound about-the core between the threads thereof, circuit connections leading to said resistance unit, and a conductor connected withone terminal of the coil, said casing having-sockets therein in line with certain I convolutions of the unit.

2. An electric heater comprising a casing having-internal threads, a core fitted in the casing and, forminga heating chamber and having external threads engaging the internal threadsof the'casing and grooves be tween said external threads, a resistance unit, embedded in the grooved surface ofv the core thereof, and c1rcu1t connections leading to said resistance unit. a

3. Anelectric heater comprising a casing having internal threads and open at each end, a core open at one end and having its opposite end closed, said core being externally threaded to engage the threads of the casing, a resistance unit embedded in the surface of the core between the threads thereof, a cap closing one end of the casing and abutting against the closed end of the core, and circuit connections leading to said resistance unit.

4. An electric heater comprising a casing having internal spiral threads, a core forming a heating chamber disposed in said casing and having external spiral threads engaging the threads of the casing and spiral grooves between said external threads, a re sistance wire disposed within the grooves, and circuit connections leading to said resistance wire, the casing being provided with plug receiving sockets therein in line with certain convolutions of the wire.

5. An electric heater comprising a casing open at each end and having internal threads, a hollow core fitted in said casing and having a heating chamber and having external threads engaging the threads of the casing, said core being open at one end and having a hemispherical opposite end portion and an annular flange extending beyond the same, a cap closing one end of the casing and provided with an inwardly projecting portion enclosed by said flange and having a concaved face receiving the hemispherical end of the core, a resistance unit embedded in the surface of the core between the threads thereof, and circuit connections leading to said resistance unit.

6. An electric heater comprising a base of insulating material, a casing of insulating material arranged above the base, a core of insulating material fitted within said casing, a spiral coil of resistance wire surrounding the core, conductors carried by the base, sockets upon the base in electrical connection with said conductors, and plugs upon the casing in electrical connection with the resistance wire and engageable with the sockets for supporting the casing from the base and connecting the resistance wire with said conductors.

7. An electric heater comprising a horizontal casing open at one end, a hollow core, forming a heating chamber, fitted longitudinally within the casing, said core being open at one end and closed at its other end, and having a circular flange projecting beyond said closed end, a cap closing one end of the casing and having a projection extending into the casing and abutting the closed end of the core and embraced by said flange, a resistance unit carried by the core, and electric circuit connections for the resistance unit.

8. An electric heater comprising a base, a casing, a core within the casing, a resistance unit carried by the core, spring plugs on the casing connected to the terminals of the core, sockets in the base to receive said plugs, and current conductors on the base leading to said sockets.

9. An electric heater comprising a casing having a series of sockets therein, a core within the casing, a resistance coil extending spirally about the core and having certain of its convolutions in register with said sockets, a supporting and conducting surface electrically connected with one terminal of the coil, a plug adapted to be fitted in any of said sockets to contact with the convolutions of the coil registering therewith, a conductor carried by the plug, and a terminal carried by said conductor and provided with gripping jaws.

10. An electric heater comprising a casing having a series of sockets therein, a core within said casing, a resistance coil extending spirally about the core and having certain of its convolutions in registry with said sockets, a supporting and conducting surface electrically connected with one terminal of the coil, and a plug adapted to be fitted in any of said sockets to contact with the convolution of the coil registering therewith.

In testimony whereof I aflix my signature MANUEL HUMBERTO PEREZ. 

